... on the ball：机灵，有见识 threw a curve ball：戏弄或使人惊讶，提及出人意料的事 step up to the plate：开始行动 ...
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threw a curve ball
投了一个弧线球
以上为机器翻译结果，长、整句建议使用 人工翻译 。
At the last minute, I threw them a curve ball by saying, "We're going to bring spouses."
在最后一刻，我给了他们一个惊喜，说：“我们会带配偶。”
《柯林斯英汉双解大词典》
The boss threw us a curve ball when he announced that each employee would have to bring his own food to the company picnic.
老板宣布每个职工自己带食物参加公司野餐时，我们都感到惊讶。
youdao
But a person who threw a curve ball did something unexpected.
VOA: special.2009.04.12
Then life threw her a curve ball.
FORBES: A Daring Career Rebound: From Telecom Bankruptcy to the UN
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